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16-24
Verifying resistance
Check normal resistance by connecting accurate resistance values to the Model 7702 and
verifying that its resistance readings are within the specified limits.
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Follow these steps to verify resistance accuracy:
1.
Figure 16-12
Connections for Model 7702 resistance verification (100
CH1
Model 7702
TE122
TE121
CH21
NOTE
Use shielded, low-thermal cables
to minimize noise. Enable or disable
calibrator external sense as indicated
in procedure.
2.
3.
4.
5.
6.
Do not apply more than 300V between Model 7702 INPUT or SENSE
H and L terminal or between any adjacent channels, or module dam-
age could occur.
Using shielded Teflon or equivalent cables in a 4-wire configuration, connect the
Model 7702 CH1 H and L INPUT terminals and CH21 H and L SENSE terminals
to the calibrator as shown in
OUTPUT
Install the Model 7702 in Slot 1 of the Model 2790, then turn on the power and
allow the unit to warm up for two hours before proceeding. Be sure the front panel
INPUTS switch is set to the REAR position.
Set the calibrator for 4-wire resistance with external sense on.
Select the Model 2790 4-wire resistance function by pressing the Ω4 key. Close
Channel 1 by pressing the CLOSE key and keying in 101.
Set the Model 2790 for the 100Ω range and make sure the FILTER is on. Enable
OCOMP (offset-compensated ohms) by pressing SHIFT then OCOMP.
Recalculate reading limits based on actual calibrator resistance values.
Model 2790 SourceMeter
Figure
16-12.
Ω
to 10M
SENSE HI
OUTPUT
HI
LO
SENSE LO
®
Switch System Reference Manual
Ω
ranges)
Resistance Calibrator
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